Mechanical trigger lock



FIG. 1 is a side view of a mechanical trigger lock showing my new design in its position of use, the material shown in dotted lines not being part of my design;

FIG. 2 is a top front left perspective view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is a rear elevation view thereof. 

The ornamental design for a mechanical trigger lock, as shown and described. 